<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>fractions linethickness</title>
    <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#fractions-mfrac">
    <link rel="help" href="https://mathml-refresh.github.io/mathml-core/#dom-and-javascript">
    <meta name="assert" content="Verifies fraction with positive, negative, percent and named space linethickness values.">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/mathml/support/feature-detection.js"></script>
    <style type="text/css">
      @font-face {
        font-family: TestFont;
        src: url("/fonts/math/fraction-rulethickness10000.woff");
      }
      math {
        /* FractionRuleThickness = 10000 * 10 / 1000 = 100px; */
        font-family: "TestFont";
        font-size: 10px;
      }
    </style>
    <script>
      function LineThickness(aId) {
        var mfrac = document.getElementById(aId);
        var numBox = mfrac.firstElementChild.getBoundingClientRect();
        var denumBox = mfrac.lastElementChild.getBoundingClientRect();
        return denumBox.top - numBox.bottom;
      }

      setup({ explicit_done: true });
      window.addEventListener("load", () => { document.fonts.ready.then(runTests); });

      function runTests() {
        var defaultRuleThickness = 100;
        var epsilon = 2;

        test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          assert_approx_equals(LineThickness("positive"),  5.67 * 10, epsilon);
        }, "Positive");

        test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          /* Negative values are treated as 0 */
          assert_approx_equals(LineThickness("negative"),  0, epsilon);
        }, "Negative");

        test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          assert_approx_equals(LineThickness("percent"), defaultRuleThickness * 234 / 100, epsilon);
        }, "Percentage");

        test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          /* Namedspace values are invalid in MathML Core. */
          assert_approx_equals(LineThickness("namedspace"), defaultRuleThickness, epsilon);
        }, "Named space");

        test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          /* Calc() expressions are invalid in MathML Core. */
          assert_approx_equals(LineThickness("calc"), defaultRuleThickness, epsilon);
        }, "Calc() expression");

        test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          document.getElementById("dynamic-attach").setAttribute("linethickness", "400%");
          document.getElementById("dynamic-modify").setAttribute("linethickness", "200%");
          document.getElementById("dynamic-remove").removeAttribute("linethickness");
          assert_approx_equals(LineThickness("dynamic-attach"), defaultRuleThickness * 4, epsilon, "attach");
          assert_approx_equals(LineThickness("dynamic-modify"), defaultRuleThickness * 2, epsilon, "modify");
          assert_approx_equals(LineThickness("dynamic-remove"), defaultRuleThickness, epsilon, "remove");
        }, "Dynamic linethickness");

        done();
      }
    </script>
  </head>
  <body>
    <math>
      <mfrac id="positive" linethickness="5.67em">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="negative" linethickness="-1.23em">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="percent" linethickness="234%">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="namedspace" linethickness="veryverythickmathspace">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="calc" linethickness="calc(20px)">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="dynamic-attach">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="dynamic-modify" linethickness="300%">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
    <math>
      <mfrac id="dynamic-remove" linethickness="300%">
        <mspace width="20px" height="10px" style="background: blue"></mspace>
        <mspace width="20px" height="10px" style="background: cyan"></mspace>
      </mfrac>
    </math>
  </body>
</html>
